This function prints the estimated conditional quantiles q_alpha(x) for each
x and alpha considered, as an array, and also the selected tuning parameter N_opt.
References
Charlier, I. and Paindaveine, D. and Saracco, J.,
Conditional quantile estimation through optimal quantization,
Journal of Statistical Planning and Inference, 2015 (156), 14-30.
Charlier, I. and Paindaveine, D. and Saracco, J.,
Conditional quantile estimator based on optimal
quantization: from theory to practice, Submitted.